Welcome to the forums! Glad you've posted a book! It looks interesting but here's some food for thought for ya.
Reds right, you don't have nearly enough offence to actually kill the other mage, mainly because GAs are great for guarding, which you should do often to keep them alive. That means you aren't attacking wirh them. Can't kill the enemy mage wirh counter attacks.
If you wanna rely on ranged attacks like a bow or attack spells to deal damage, you'd better have a hawkeye for your mage. That extra die adds up!
I know the priestess has awesome channelling you begin with but without ANY channelling generators (except for one discount ring) you will still find yourself out of mana very fast.
You've got 7 creatures, one of which costs over 20 mana, all of which yiu must full cast. You've got no open full actions to use that bow with. That's gonna be mana taxing especially when the vast majority of your creatures are over 10 mana. You're not gonna habe the time to play all those creatures and still move, attack, or cast any of those conjurations you're packing.
Galvanize is a waste with a priestess. You can just remove those conditions without the needed face down contingency. If you're counting on them buffing the angels keep I mind that they only get hit about 5/8ths of the time did they are that much less likely to get conditions.
Radiant breastplate is an odd choice due to the high number of guard or imtercept creatures you have, meaning you won't be using the 2 mana guard much, so id rather a dragonscale hauberk, or another chest piece with an elemental defence.
You don't have enough swarm potential to use merraveren. Esp when mist of your creatures have defences.
Demonic bloodlust. I get what your looking to do, but thets cheaper and better ways to get 2 extra dice, without the drawback and huge sp tag. If you're splashing into dark with holy mages, poisoned blood is a much better choice.
You've got a massive assortment of Equipment here, but much of it doubles locations. 2 gloves boots. Amd helmets. Tgats gonna leave you with a lot of dead cards in your book.
More later if yout want. Sorry long day